Percussion-tool.



C. PAULI. PERCUSSION TOOL.

APPLICATION rum) APR.3. 191:.

1,11 9,866, Patented Dec. 8, 1914;

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CARL PAULI, OF IROSELI-E PARK, NEW JERSEY, ASSIGNOR TO HENRY B. NEWI-IALL, SR., OF .PLAINFIELD, NEW JERSEY.

PERCUSSION-TOOL.

Specification of Letterslatent.

PatentedDec. 8, 1914.

Application filed April 3, 1913. Serial No. 758,582.

To all whom it may concern:

Be it known that I, CARL .PAULT, a citizen of the UnitedStates, residing in Roselle Park, in the county of Union and State of NewJersey, have invented certain new and useful Improvements in Percussion-'lools, of which the following is a specification.

My invention is an improved rapid fire or quick-acting hammer operable from a revolved member to convert its revolution into a rapid succession of blows delivered substantially in the prolongation of its axis.

It is primarily designed for light percussive work, such as chipping, riveting or drilling; to be held to the work with one hand and worked by the other with a bitbrace or other crank like tool; but it can be driven from any power-shaft or spindle, and is very useful as an auxiliary to rotative machine-tools such as drill'presses and lathes, to convert the rotation of their spindles into percussion. Compared with known percussion tools, it is simple, light, strong and can be very quickly taken apart 25 for inspection and repair and reassembled.

It comprises three principal parts, viz a tubular rotor with interior, plural, hammerretracting cams and an axial drive-shank; a spring advanced cylindrical hammer with radially mounted positioning and retracting rolls; and an axially-pivoted hinged discoidal hand-frame or socketed holder, held closed by a screw union and having a handle, coaxial tool, and rotor-sockets and axially extending stay-guides to stay the hammer from rotation. For inspection or repairs the union nut is unscrewed, and the socketed holder opened or parted, to free the rotor whose hammer and spring can then be dropped out.

In the drawings, Figure 1 is an axial section on the line 2-2 of Fig. 2. Fig. 2 is a plan of the rotor sectional on line 1--1of Fig. 1 and of the socketed holder opened; Fig. 3 illustrates the relation of the hammer and its rolls to the guide;stay of the socketed holder; Fig. 4 is a diametrical sec- 1 tion, and Fig. 5 an end view of the rotor cam-head, and Fig. 6 a diametrical section of the socketed holder, perpendicular to its parting, on line 6-6.of Fig. 2.

' The principal members ofmy invention are arranged co -axially and are as follows: The tubular, cylindrical, outwardly-smooth 55 rotor 1; the cylindrical hammer 26 and blow-spring 32 inclosed and operative therein; and the hanchframe or socketed holder 9.

To combine the greatest lightness and elliclency with strength and safety, the holder 9 is discoidal and merely thick enough to contain the cylindrical rotor-socket 10; in which the rotor 1 is revolubly mounted by its terminal flange 11. For lightness the rotor 1 is built up of a cast cap 5 containing a threaded socket and terminating in a drive-shank 3 suitable for connection with a brace or spindle chuck; a cast hollow-cylinder cam-head 6 formed with the terminal mounting flange 11, a plurality of pairs of opposite, preferably helical cams 8, and an axial threaded socket; and a wroughtmetal threaded nipple, 2, uniting said cap 5 and cam-head 6, by. being screwed into their respective threaded sockets, and secured in the cap. as by a jam-nut 4 and in the cam-head. as bv rivets 7. For quick in spection, repair and replacemenhthe holder 9 is parted, preferably on a diameter. into halves 18 and 19 jointed by a slip-hinge 20 formed of a pintle cast on one half (as 18) and a socket on the other. and when closed secured by union nuts. 15 or or both, screwed upon threaded. matching partedcylinder stumps. 12. or 21-22, one of whose respective parts is formed on one. the other on the other holder-part. 18, 1 Either union would secure the holder. The parted stump 21. 22 also serves for attaching the handle 24: hr means of the union nut 25 formed in its ferrule. stump 12, contains the drill-socket 13, through which the drill 14 extends its butt 33, "to receive blows. The union nut 15 is long enoughto form the necessary flangechamber for the drill-flange 17 and drillspring 16, which respectivelv prevent the drill from dropping out and return it after blows, as usual in such tools.

To complete the housing of the hammer, there are provided on the two lower members 18 and 19 a pair ofinwardlv-proiecting stay guides 34. 35, with axial faces to stay the hammer from rotation and guide it. The hammer 26 floats in the rotor 1 and adiacent to its head has a radial arbor 31 and thereon. a pair of retraction rolls 28, 30. to coact with the cams 8 when the rotor is rotated and a pair of stay-rolls. 27. 29 to coact with the stay-guides 34, 35 of the The axial parted f holder 9 to guide and stay the hammer so that the cams 8 may retract it, compress the spring and subsequently release the hammer, to strike. While the hammer would operate with single retraction and stay rolls, and one stay guide, as 29, 3O, 34:, arranging them in pairs balances the motions and reactions and makes the hammer Work smoothly.

The operation is as follows: The user grasps the handle 24 and thereby holds the tool to its work and stays the holder 9 and its stay-guides 34, 35. Power applied at the shank 3 rotates the rotor'l clockwise with the arrow 36, and the hammer 26 being stayed by the coaction of its stay-rolls 27, 29 With said stay-guides, pairs of cams 8 coact With the retraction rolls 28 30, retract the hammer 26, compress the spring 32 and subsequently pass the said rolls and release the hammer, to strike.

1. A percussion tool comprising a tubular rotor having at one end and secured to rotate therewith a cylindrical cam head of substantially greater diameter than said rotor, a plurality of hammer retraction cams along the wall of said cam head'at such a distance from said rotor as to afio'rd' a very gradual incline to the cams, a hammer in said tubular rotor, and a blow spring for operating said hammer, an arbor at one end of said hammer extending from opposite sides of said hammer, a roller on each extension of said arbor and in engagement with said cams to operate to retract said hammer, said two oppositely extending rollers serving to steady said hammer, and a socketed holder formed with a rotor socket for revolubly mounting said rotor and a tool socket.

2. A percussion tool comprising a tubular rotor having at one end and secured to rotate therewith a cam head of substantially greater diameter than said rotor, a cylindrical wall on said cam head, a plurality of hammer retraction cams positioned along the wall of said cam head, said cams being removed fromsaidtubular rotor such a distance as to afiord a very gradual incline to the cams, a hammer in said tubular rotor, a blow spring for operating said hammer, an arbor at one end of said hammer having portions extending from opposite sides of said hammer, a roller on each. portion of said arbor and in engagement with said cams to operate to retract saidhammer, said oppositely positioned rollers serving to steady said hammer, and a socketed holder formed with a rotor socket for revolubly mounting said rotor and a tool socket, and on saidholder a handle and means to stay said holder from rotation relatively to said holder.

3. A percussion tool comprising a tubular rotor terminating at one end in a driveshank, a plurality of hammer-retraction cams interior to said rotor, and operative therein a blow spring and a hammer; a retraction roll on said hammer to engage said cams; and a parted socketed holder containing a rotor socket for revolubly mounting said rotor and a tool-socket, and on said holder a handle and means to stay said hammer from rotation relatively to said holder, a hinge joining the parts of said holder and securing means to unite said holder-parts when. closed.

4. A percussion tool comprising a tubular rotor terminating at one end in a driveshank, a plurality of hammer-retraction cams interior to said rotor, and operative therein a blow-spring and a hammer; a retraction roll on said hammer to engage said cams; and a parted socketed holder containing a rotor socket for revolubly mounting said rotor and a tool-socket, and on said holder a handle and an axially-extending stay-guide to guide the reciprocation of said hammer and stay it from rotation relatively to said holder, a hinge joining the parts of said holder andsecuring-means'to unite said holder-parts when closed. I

5'. A percussion tool comprising a tubular rotor having at one end and secured to rotate therewith a cam head of substantially greater diameter than said rotor, a cylindri} cal wall on said cam head, a plurality of hammer retraction cams positioned along the wall of said cam head, said" cams being removed from said tubular rotor such a distance as to afford a very gradual incline to the cams, a hammer in said tubular rotor, a blow spring for operating said hammer, a plurality of roller receiving portions extending radially from one end of said hammer, a roller on each of said portions, and in engagement With said cams to operate to retract said hammer, said roller also serving to steady said hammer, and a socketed holder formed with a rotor socket for frevol'u'bly mounting said rotor and a tool socket.

6. A pe'rcussiontool comprising-a diametrally parted, hinged, d'iscoidal, socketed holder containing a rotor-socket and atool socket; a handle and a hamm'er-stay-guide on said holdera'nd on the parts thereof externally-threaded matching screw-parts; a nut screwed on said screw-parts uniting said holder parts when closed; revolubly mounted in said rotor socket a tubular rotor, hammerretraction cams interior thereto; and operative therein a blow-spring and? a hammer adapted to engage said cams stay-guide.

7, A percussion tool comprising a diametrallyparted, hinged, discoidal, socketed holder containing a rotor socket and a tool socket; a h'ammer-stay-guide on said holder and on the parts thereof externally-threaded matchingscreW-parts, a handle containinga nut screwed on'said screw parts uniting said holder parts when closed; revolubly mounts ed in said rotor socket a tubular rotor, hammer'retraction cam interior thereto and operative therein a blow-spring and a hammer adapted to engage said cams and stay-guide.

8. A percussion tool rotor-holder adapted to revolubly mount a rotor and comprising hinged, matching, disooid-parts containing when closed a tool-socket and a rotor-socket,

said discoid-parts having hammer-stay- 10 CARL PAULI.

Witnesses HENRY B. NEWHALL, Sr., A. M. WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents, Washington, D. 0. 

